| 摘要 |
PURPOSE:To shift a loading member for recording medium to a desired position with the actuation of a switch by reversing the revolving direction of a motor if the motor does not revolve due to the overload when the motor is revolved in a prescribed direction. CONSTITUTION:Transistors 22 and 23 detect the current flowing to a resistor 21 to detect the revolutions of a motor 33. A motor driving circuit 32 gives forward and reverse revolutions to the motor 33 with signals from terminals F and R. When the coincidence is obtained between the revolving direction of the motor 33 and the shifting direction of a loading member 10, the motor 33 is revolved to shift the member 10. The operation of the motor 33 is stopped when the load of the motor is increased. When no coincidence is obtained for direction between the motor 33 and the member 10, the revolution of the motor 33 is impossible owing to the large load. Then the revolving direction of the motor is reversed, therefore the motor 33 is driven to shift the member 10 to the forward direction, i.e., in the reciprocating direction. |
